Is it OK to take 100 mcg levothyroxine + 50 mcg per day?

I was on 100 mcg levothyroxine for years, recently Dr changed it to 112... I had a bad reaction, panic attacks, headaches, So now I was told to take 100 mcg Monday - Saturday then on Sunday cut the pill in half and take 1 &1/2 pills... so 100 + 50. Is this OK? I am worried about another panic attack